<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .out,
        .out > * {
            box-sizing: border-box;
        }

        .out {
            width: 200px;
            height: 200px;
            margin: 50px auto;
            background-color: skyblue;
            position: relative;
        }

        .out > div {
            position: absolute;
            transition: all .7s ease;
        }

        .out .left,
        .out .right {
            height: 140px;
            width: 1px;
            top: 30px;
            transform: rotateX(80deg);
        }

        .out:hover .left,
        .out:hover .right {
            transform: rotateX(0deg);
            background-color: white;
        }

        .out .left {
            left: 30px;
        }

        .out .right {
            left: 170px;
        }

        .out .top,
        .out .bottom {
            width: 140px;
            height: 1px;
            left: 30px;
            transform: rotateY(80deg);
        }

        .out:hover .top,
        .out:hover .bottom {
            transform: rotateY(0deg);
            background-color: white;
        }

        .out .top {
            top: 30px;
        }

        .out .bottom {
            top: 170px;
        }

        .out .in {
            height: 139px;
            width: 139px;
            left: 31px;
            top: 31px;
            overflow: hidden;
        }

        .out .in > * {
            height: 139px;
            width: 139px;
            line-height: 139px;
            text-align: center;
            color: transparent;
            font-size: 24px;
            font-family: 方正启体简体, serif;
            background-color: skyblue;
            transform: translateY(50px);
            transition: all .7s ease;
        }

        .out:hover .in > * {
            transform: translateY(0px);
            color: white;
        }

        .circlebox {
            height: 360px;
            width: 640px;
            margin: 100px auto;
            background: url("../css-3-3d&动画/image/riven/1.jpg");
            position: relative;
        }

        .circle {
            display: inline-block;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            height: 50px;
            width: 50px;
            border-radius: 25px;
            border: 2px solid white;
            transition: all 0.5s ease;
            box-shadow: rgba(255, 255, 255, 0.8) 0 0 20px;
            background-color: rgba(0, 0, 0, 0);
        }

        .circle:hover {
            cursor: pointer;
            box-shadow: rgba(255, 255, 255, 1) 0 0 30px;
        }
    </style>
</head>

<body>
<div class="out">
    <div class="top"></div>
    <div class="bottom"></div>
    <div class="left"></div>
    <div class="right"></div>
    <div class="in">
        <div>Look at me!</div>
    </div>
</div>
<div class="circlebox">
    <button class="circle"></button>
</div>
</body>

</html>